Tunic with two vertical stripes?

[Mervlvs]

Furthermore the clavi on tunics from military sites in Egypt from the first to second century come in various colours including purple.

So...it won´t be a madness if a centurio from 1st-2nd  wore  it, being not in purple for example, like the following pic

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I don't know if the ordinary clavii meant anything in particular - perhaps just a fashion thing?

Even in the army?